How do I customize PostgreSQL configurations using helm chart? - kubernetes

Question

I'm trying to deploy an application that uses PostgreSQL as a database to my minikube. I'm using helm as a package manager, and add have added PostgreSQL dependency to my requirements.yaml. Now the question is, how do I set postgres user, db and password for that deployment? Here's my templates/applicaion.yaml
apiVersion: v1
kind: Service
metadata:
name: {{ template "sgm.fullname" . }}-service
spec:
type: NodePort
selector:
app: {{ template "sgm.fullname" . }}
ports:
- port: 80
targetPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ template "sgm.fullname" . }}-deployment
spec:
replicas: 2
selector:
matchLabels:
app: {{ template "sgm.fullname" . }}
template:
metadata:
labels:
app: {{ template "sgm.fullname" . }}
spec:
containers:
- name: sgm
image: mainserver/sgm
env:
- name: POSTGRES_HOST
value: {{ template "postgres.fullname" . }}.default.svc.cluster.local
I've tried adding a configmap as it is stated in the postgres helm chart github Readme, but seems like I'm doing something wrong

Answer 1

This is lightly discussed in the Helm documentation: your chart's values.yaml file contains configuration blocks for the charts it includes. The GitHub page for the Helm stable/postgresql chart lists out all of the options.
Either in your chart's values.yaml file, or in a separate YAML file you pass to the helm install -f option, you can set parameters like
postgresql:
postgresqlDatabase: stackoverflow
postgresqlPassword: enterImageDescriptionHere
Note that the chart doesn't create a non-admin user (unlike its sibling MySQL chart). If you're okay with the "normal" database user having admin-level privileges (like creating and deleting databases) then you can set postgresqlUser here too.
In your own chart you can reference these values like any other
- name: PGUSER
value: {{ .Values.postgresql.postgresqlUser }}